FindJava: Fix typos in IdlJ and JarSigner component implementation

Fix typos introduced by commit v3.4.0-rc1~257^2~2 (FindJava: Add support
for idlj and jarsigner tools, 2015-07-31) to correctly report when these
components are found.

Modules/FindJava.cmake

@@ -228,12 +228,12 @@ if(Java_FIND_COMPONENTS)
       endif()
     elseif(component STREQUAL "IdlJ")
       list(APPEND _JAVA_REQUIRED_VARS Java_IDLJ_EXECUTABLE)
-      if(Java_IdlJ_EXECUTABLE)
-        set(Java_Extra_FOUND TRUE)
+      if(Java_IDLJ_EXECUTABLE)
+        set(Java_IdlJ_FOUND TRUE)
       endif()
     elseif(component STREQUAL "JarSigner")
       list(APPEND _JAVA_REQUIRED_VARS Java_JARSIGNER_EXECUTABLE)
-      if(Java_IDLJ_EXECUTABLE)
+      if(Java_JARSIGNER_EXECUTABLE)
         set(Java_JarSigner_FOUND TRUE)
       endif()
     else()